Numerical simulation method for seismic response of construction hanging basket

Abstract

The invention discloses a numerical simulation method for earthquake response of a construction hanging basket, which is mainly used in a bridge construction process in a high-earthquake region to ensure the safety and feasibility of the construction hanging basket under the action of an earthquake. By simulating the response of the hanging basket in the earthquake, the stability of the hanging basket can be predicted and evaluated, so that the damage of the earthquake to the construction hanging basket is reduced, and casualties and property loss are avoided. By accurately simulating and evaluating the influence of the earthquake on the construction hanging basket, construction interruption and reconstruction cost caused by the earthquake can be reduced, so that a large number of economic resources are saved. The construction period can be shortened and the construction efficiency can be improved by optimizing the construction scheme and the construction method, so that the construction cost is reduced. Scientific basis can be provided for formulating and perfecting related construction safety laws and regulations and standards, and scientificity and practicability of the laws and regulations and standards are improved.

Description

Technical Field

[0001] The invention relates to the technical field of stress analysis, and in particular to a numerical simulation method for earthquake response of a construction hanging basket. Background Art

[0002] The hanging basket is a load-bearing frame that can slide or roll along the top of the beam. It is anchored and suspended on the constructed beam section to provide an aerial platform for the construction of the next section. After completing the construction of one section, the hanging basket can be moved forward and fixed to carry out the construction of the next section. During the construction of bridges in high-seismic areas, they are often affected by earthquakes, which causes the construction hanging basket to become unstable and damaged, ultimately causing casualties and property losses. In order to ensure the safety and feasibility of hanging basket construction in high-seismic areas, it is necessary to perform numerical simulation of the seismic response of the construction hanging basket to ensure the safety of bridge engineering projects. However, the existing numerical simulation technology basically does not take into account the seismic amplification relationship between the bridge and the hanging basket, and there is no specific interaction function to express this relationship. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a numerical simulation method for earthquake response of a construction hanging basket, which can predict and evaluate the stability of the hanging basket by simulating the response of the hanging basket in an earthquake.

[0004] In order to solve the above problems, the present invention provides a numerical simulation method for the seismic response of a construction hanging basket, comprising the following steps:

[0005] S1. Prepare specimens: Determine bridge stiffness K 1 K 2 K 3 ...K n , bridge mass M 1 M 2 M 3 ……M n , basket stiffness k 1 k 2 k 3 ……k n , construction hanging basket mass m 1 m 2 m 3 ……m n , determine the hanging basket layout position X 1 X 2 X 3 ...X n , construction basket height h 1 h 2 h 3 ……h n ,Construction basket width b 1 b 2 b3 ……b n ;

[0006] S2. Test: The bridge model and the hanging basket model were fixed on the vibration table and subjected to different accelerations a. 1 a 2 a 3 ……a n The seismic wave was tested and the independent seismic response λ of the hanging basket was measured. 1 λ 2 λ 3 ... n ; Then the hanging basket is combined with the bridge model, and the seismic wave of the above working condition is tested to measure the seismic response λ' after the hanging basket combination is assembled 1 λ' 2 λ' 3 ……λ' n ;

[0007] S3. Analysis: The seismic response of the bridge model and the hanging basket model is calculated by the shaking table test to calculate the amplified response relationship of the seismic action to the construction hanging basket. 1 S 2 S 3 ……S n , regression analysis is performed on the combined models of different groups of hanging baskets and bridges to fit the final amplification response relationship S between the bridge and the hanging basket; numerical simulation calculation and analysis are performed through the following differential equation:

[0008]

[0009] The displacement parameter {Λ} can be obtained by calculating the differential equation. In order to ensure the safety of the hanging basket under earthquake action, the displacement parameter {Λ} must satisfy the following formula:

[0010]

[0011] In the formula, i represents the effects of small earthquakes, medium earthquakes and large earthquakes, respectively, {Λ i} is the maximum allowable displacement. The maximum allowable displacements for small earthquakes, moderate earthquakes and large earthquakes correspond to the elastic intact limit state, damage control limit state and controlled collapse limit state, respectively.

[0012] Preferably, when preparing the test specimens, S1 needs to prepare several unformed concrete bridge models and construction hanging basket models, clean and remove impurities on the sample surface to ensure accurate measurement.

[0013] Preferably, numerical simulation analysis is also required during the S3 analysis process, including:

[0014] S3.1 According to the actual engineering situation, the bridge and hanging basket models are established using abaqus software, the models are assembled in the assembly module, the material properties and cross-sections are assigned according to the engineering design, the module parameters of the gravity and seismic analysis steps are set, the model boundary relationship is laid out and the seismic wave is input; the seismic wave is simulated by selecting the frequent earthquake, basic earthquake and rare earthquake with the corresponding peak acceleration according to the specification;

[0015] S3.2 Set the amplified response relationship S between the bridge and the hanging basket in the interaction relationship and set the corresponding parameters; perform meshing on the model, submit the model analysis in the operation module, perform numerical simulation calculations, and simulate the impact of seismic waves on the bridge and the hanging basket;

[0016] S3.3 ultimately simulates the seismic response of the construction basket under the action of seismic waves. The stress cloud map can be used to confirm the weakest position of the basket, and to determine whether there is damage under an earthquake of the corresponding intensity. If there is a problem, it can be reinforced during the design phase. The displacement cloud map and acceleration cloud map can be used to confirm whether the structure is stable and whether the construction workers are sufficiently safe during an earthquake.

[0017] The advantages of the present invention compared with the prior art are:

[0018] A numerical simulation method for earthquake response of a construction basket of the present invention is mainly used in the process of bridge construction in high-seismic areas to ensure the safety and feasibility of the construction basket under earthquake action. By simulating the response of the basket in an earthquake, the stability of the basket can be predicted and evaluated, thereby reducing the damage caused by the earthquake to the construction basket, avoiding casualties and property losses. By accurately simulating and evaluating the impact of earthquakes on the construction basket, the construction interruption and reconstruction costs caused by earthquakes can be reduced, thereby saving a large amount of economic resources. Optimizing construction plans and construction methods can shorten the construction period, improve construction efficiency, and thus reduce construction costs. It can provide a scientific basis for formulating and improving relevant construction safety laws and standards, and improve the scientificity and practicality of laws and standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is the displacement curve of the hanging basket under different parameter setting conditions of the same bridge model after the hanging basket is subjected to the earthquake amplification effect in the present invention;

[0021] Figure 2It is a stress cloud diagram of the upper structure of the hanging basket of the present invention;

[0022] Figure 3 It is the concrete constitutive model curve diagram of the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0026] Combination Figure 1 to Figure 3 A numerical simulation method for the seismic response of a construction hanging basket of the present invention comprises the following steps:

[0027] S1: Prepare the test piece

[0028] Prepare several unformed concrete bridge models and construction basket models, clean and remove impurities on the sample surface to ensure accurate measurement. Determine the bridge stiffness K 1 K 2 K 3 ...K n , bridge mass M 1 M 2 M 3 ……M n , basket stiffness k 1 k 2 k 3 ……k n , construction hanging basket mass m 1 m 2 m 3 ……m n , determine the hanging basket layout position X 1 X 2 X 3 ...X n , construction basket height h 1 h2 h 3 ……h n ,Construction basket width b 1 b 2 b 3 ……b n .

[0029] S2: Experimental

[0030] The bridge model and the hanging basket model were fixed on the vibration table and subjected to different accelerations a. 1 a 2 a 3 ……a n The seismic wave was tested and the independent seismic response λ of the hanging basket was measured. 1 λ 2 λ 3 ... n The hanging basket was combined with the bridge model and tested with the seismic waves of the above working conditions. The seismic response λ' of the hanging basket after assembly was measured. 1 λ' 2 λ' 3 ……λ' n .

[0031] S3: Analysis

[0032] The seismic response of the bridge model combined with the hanging basket model was calculated by shaking table test, and the amplified response relationship S of the construction hanging basket to the seismic action was calculated. 1 S 2 S 3 ……S n , regression analysis is performed on the combined models of different groups of hanging baskets and bridges to fit the final amplification response relationship S between the bridge and the hanging basket. Numerical simulation and analysis are performed through the following differential equation:

[0033]

[0034]

[0035] The displacement parameter {Λ} can be obtained by calculating the differential equation. In order to ensure the safety of the hanging basket under earthquake action, the displacement parameter {Λ} must satisfy the following formula:

[0036]

[0037] In the formula, i represents the effects of small earthquakes, medium earthquakes and large earthquakes, respectively, {Λ i} is the maximum allowable displacement. The maximum allowable displacements for small earthquakes, moderate earthquakes and large earthquakes correspond to the elastic intact limit state, damage control limit state and controlled collapse limit state, respectively, and are given by the code.

[0038] S3.1: According to the actual engineering situation, the bridge and hanging basket models are established respectively. The bridge steel bar components, concrete components and hanging basket components are established in the component module. The material properties of concrete and steel are set according to the "Concrete Structure Design Code" (GB50010-2010). The model is assembled in the assembly module, and the material properties and cross-sections are assigned according to the engineering design. The module parameters of the gravity and seismic analysis steps are set, the model boundary relationship is arranged, and the seismic wave is input. The seismic wave is simulated by selecting the frequent earthquake, basic earthquake and rare earthquake with the corresponding peak acceleration according to the code.

[0039] S3.2: Set the amplified response relationship S between the bridge and the hanging basket in the interaction relationship and set the corresponding parameters. Perform meshing on the model, submit the model analysis in the operation module, perform numerical simulation calculations, and simulate the impact of seismic waves on the bridge and the hanging basket.

[0040] S3.3: Finally, the earthquake response of the construction basket under the action of seismic waves is simulated. The weakest position of the basket can be confirmed through the stress cloud map, and it can be judged whether there is damage under the earthquake of the corresponding intensity. If there is a problem, it can be reinforced in the design stage. The displacement cloud map and acceleration cloud map can be used to confirm whether the structure is stable and whether the construction workers are safe enough in the earthquake.

[0041] The method principle of the present invention is:

[0042] Under the action of an earthquake, seismic waves start from the bedrock, and after filtering and energy accumulation in the soil layer of the site, they will be transmitted to the bridge with an amplified amplitude. The bridge filters and amplifies the seismic waves and then transmits them to the hanging basket on the top. Since the mass and stiffness of the hanging basket are much smaller than those of the corresponding lower bridge structure, when subjected to the earthquake action after the amplitude is continuously amplified, the dynamic response and displacement response of the hanging basket undergo drastic changes. Based on the commonly used construction hanging basket, the present invention proposes a numerical simulation method for simulating the seismic response of the construction hanging basket.

[0043] like Figure 3 As shown, the marked square curve is without setting the amplification response parameter, the marked circular curve is with setting the amplification response parameter, and the marked triangle curve is the test value. When the parameters are not set, the error between the finite element simulation result and the actual result is 112.3%, which is very different. After setting the parameters, the error is reduced to 28.6%. The present invention effectively simulates the earthquake amplification effect on the hanging basket and greatly reduces the numerical simulation error.

[0044] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A numerical simulation method for the seismic response of a construction hanging basket, characterized in that: The following steps are involved: S1. Prepare specimens: Determine bridge stiffness K1K2K3...K n , bridge quality M1M2M3……M n , basket stiffness k1k2k3……k n , construction hanging basket mass m1m2m3……m n , determine the hanging basket layout position X1X2X3……X n , construction hanging basket height h1h2h3……h n ,Construction basket width b1b2b3……b n ; S2. Test: Fix the bridge model and the hanging basket model on the vibration table respectively, and set them at different accelerations a1a2a3…a n The seismic wave test was carried out and the independent seismic response of the hanging basket was measured as λ1λ2λ3……λ n ; Then the hanging basket is combined with the bridge model, and the seismic wave of the above working condition is tested, and the seismic response of the hanging basket after assembly is measured λ'1λ'2λ'3……λ' n ; S3. Analysis: The earthquake response of the bridge model and the hanging basket model is calculated through the shaking table test to calculate the amplified response relationship of the earthquake action to the construction hanging basket S1S2S3……S n , regression analysis is performed on the combined models of different groups of hanging baskets and bridges to fit the final amplification response relationship S between the bridge and the hanging basket; numerical simulation calculation and analysis are performed through the following differential equation: The displacement parameter {Λ} can be obtained by calculating the differential equation. In order to ensure the safety of the hanging basket under earthquake action, the displacement parameter {Λ} must satisfy the following formula: In the formula, i represents the effects of small earthquakes, medium earthquakes and large earthquakes, respectively, {Λ i } is the maximum allowable displacement. The maximum allowable displacements for small earthquakes, moderate earthquakes and large earthquakes correspond to the elastic intact limit state, damage control limit state and controlled collapse limit state, respectively.

2. The numerical simulation method of the seismic response of a construction hanging basket according to claim 1 is characterized in that: When preparing the test specimens in S1, it is necessary to prepare several unformed concrete bridge models and construction hanging basket models, clean and remove impurities on the surface of the samples to ensure accurate measurement.

3. The numerical simulation method of the seismic response of a construction hanging basket according to claim 1 is characterized in that: The S3 analysis process also requires numerical simulation analysis, including: S3.1 According to the actual engineering situation, the bridge and hanging basket models are established using abaqus software, the models are assembled in the assembly module, the material properties and cross-sections are assigned according to the engineering design, the module parameters of the gravity and seismic analysis steps are set, the model boundary relationship is laid out and the seismic wave is input; the seismic wave is simulated by selecting the frequent earthquake, basic earthquake and rare earthquake with the corresponding peak acceleration according to the specification; S3.2 Set the amplified response relationship S between the bridge and the hanging basket in the interaction relationship and set the corresponding parameters; perform meshing on the model, submit the model analysis in the operation module, perform numerical simulation calculations, and simulate the impact of seismic waves on the bridge and the hanging basket; S3.3 ultimately simulates the seismic response of the construction basket under the action of seismic waves. The stress cloud map can be used to confirm the weakest position of the basket, and to determine whether there is damage under an earthquake of the corresponding intensity. If there is a problem, it can be reinforced during the design phase. The displacement cloud map and acceleration cloud map can be used to confirm whether the structure is stable and whether the construction workers are sufficiently safe during an earthquake.

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